A simple table for a linear programming problem is given below: 5 2 3 0 0 0 \[{{X}_{1}}\] \[{{X}_{2}}\] \[{{X}_{3}}\] \[{{X}_{4}}\] \[{{X}_{5}}\] \[{{X}_{6}}\] Z \[{{X}_{4}}\] 1 2 2 1 0 0 8 \[{{X}_{5}}\] 3 4 1 0 1 1 7 \[{{X}_{6}}\] 2 3 4 0 0 1 10 Which one of the following correctly indicates the combination of entering and leaving variable?

• A. \[{{X}_{1}}\] and \[{{X}_{4}}\]
• B. \[{{X}_{2}}\] and \[{{X}_{6}}\]
• C. \[{{X}_{2}}\] and \[{{X}_{5}}\]
• D. \[{{X}_{3}}\] and \[{{X}_{4}}\]